1 files changed, 6 insertions, 1 deletions

diff --git a/src/nat/gnunet-helper-nat-server-windows.c b/src/nat/gnunet-helper-nat-server-windows.c
index b15752d8e..d970ffd70 100644
--- a/src/nat/gnunet-helper-nat-server-windows.c
+++ b/src/nat/gnunet-helper-nat-server-windows.c
@@ -71,6 +71,11 @@
 #define NAT_TRAV_PORT 22225
 
 /**
+ * Must match packet ID used by gnunet-helper-nat-client.c
+ */
+#define PACKET_ID 256
+
+/**
  * TTL to use for our outgoing messages.
  */
 #define IPDEFTTL 64
@@ -265,7 +270,7 @@ send_icmp_echo (const struct in_addr *my_ip)
   ip_pkt.vers_ihl = 0x45;
   ip_pkt.tos = 0;
   ip_pkt.pkt_len = htons (sizeof (packet));
-  ip_pkt.id = htons (256);
+  ip_pkt.id = htons (PACKET_ID);
   ip_pkt.flags_frag_offset = 0;
   ip_pkt.ttl = IPDEFTTL;
   ip_pkt.proto = IPPROTO_ICMP;